Improvement in door-springs



G. W. OLD HAML Door-Springs". "No. 140,638. Patentedjuly8,1873.

Inventor:

Per m Aflorneys.

. of Leipsic, inthe county of Orange and State J of Indiana, havemvented-a new and useful cylinder partly filled with liquid. and contain- I lever, to .which the piston is connect-edjby a the piston-is attached is retarded so as to pre- UNITED STATES PATENT TFFICE;

, CHARLES wQotnrmn, or Lnrrsrqmnmnn,

IMPROVEMENT lN DOOR- SPRI NGS.

Specification forming part of Letters Patent n 140,038, emu July 8, 1873; application filed May 24, 1873.

To all .whom it may concern:

Be it known that I, CHARLES W. OLDH'AM,

Improvement in Door-Springs, of which the following is'a specification: Y

My invention consists of a hollow vertical ing a piston with'a valve, which opens freely to allow-the piston to rise unobstructed] y when the door opens, and raises the arm of an elbowrod, but which closes the passage, except a small-orifice, when the door closes and forces the piston down, so thatthe closing of the door by a spring attached to the arm'to which vent slamming. The drawing represents a sectional elevation of the cylinder and piston, and side elevation of the elbow-lever'and spring.

A is the cylinder; B, the piston; 0, the piston-rod; D, the elbow-lever; E, the spring; F, the "alve of the piston -and G, the orifice through the valve. a

The cylinder is attachedin an upright position to the wallet the side of the door. The lever is pivoted to the wall, and the'upper end B is connected to the door by' a rod, and-the spring is fastened at the lower end to the wall and at the-upperend to the arm of the lever,

to which the piston is connected near the pivot. A series of notches is provided in. the arm for connecting the spring more or less distant only through the small orifice G that the fluid can pass, which limits the time of closing the door to that required for the liquid to rise:

above the piston.

Having thus described my invention, I claim as new and desire to secure by Letters Patent The valved piston B F, having two plates, of which the upper has a small and the lower 1 a large aperture, and operating, in connection with the parts A OD E, to prevent the slamming of doors in the manner described, CHARLES W. OLDHARL- .Witnesses:

ROBERT R.- R. STEWART, J urns Q. STEWART. 

